单项选择题

—Sorry I've broken your bike. —Oh,

A． it's all right.
B． not at all.
C． you're welcome.
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Monica had her car ______ yesterday.
A． mend
B． mending
C． mended
单项选择题
______, I didn't know how to use the machine.
A． At beginning
B． At first
C． At start
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